Ah, "in the limbs." So you're building glass-lam bows? For all-wood bows, I've found no better combo than an osage bow backed with boo. As I understand it, if you get the glass right it doesn't matter tremendously what woods you use inside. I've also built a few osage board bows with one lam of glass on the back, rather than boo. It's super easy, at least semi-natural, and not a one has failed or suffered string-follow. Whatever -- any bow build is more personally satisfying than any bow bought. Have fun.